645161545 has 8 divisors (see below), whose sum is σ = 884793024. Its totient is φ = 442396464.

The previous prime is 645161537. The next prime is 645161567. The reversal of 645161545 is 545161546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645161545 - 2³ = 645161537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9216559 + ... + 9216628.

It is an arithmetic number, because the mean of its divisors is an integer number (110599128).

Almost surely, 2^645161545 is an apocalyptic number.

It is an amenable number.

645161545 is a deficient number, since it is larger than the sum of its proper divisors (239631479).

645161545 is a wasteful number, since it uses less digits than its factorization.

645161545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18433199.

The product of its digits is 72000, while the sum is 37.

The square root of 645161545 is about 25400.0304133676. The cubic root of 645161545 is about 864.0843864944.

Subtracting from 645161545 its reverse (545161546), we obtain a palindrome (99999999).

The spelling of 645161545 in words is "six hundred forty-five million, one hundred sixty-one thousand, five hundred forty-five".